stemsee wrote: Tue Feb 25, 2025 8:28 am
I have a use for it but using the arrow keys results in keycodes. How to correct?
Well, it can read the keys and skip them.
Code: Select all
while true ;do
IFS='' read -rsN 1 ound
if [[ $ound == $'\x1b' ]]; then
read -rsn2 -t 0.1 dummy && continue
fi
if [[ $ound == $'\x7f' ]] ;then
buffer=${buffer%?}
echo -ne "\b" >&2
else
buffer=$buffer$ound
echo -n "$ound" >&2
fi
echo -e "\f"
echo "$buffer"
done | yad --text-info --width=200 --height=200 --tail
---------------------------
I experimented a bit, suppressing contol combinations was tricky.
You may also need word wrapping or character wrapping.
This is with word wrapping:
Code: Select all
#!/bin/bash
LINE_WIDTH=45 # Characters per line before wrapping
while true ;do
IFS='' read -rsN 1 ound
case $ound in
$'\x1b') # Handle escape sequences (like arrow keys)
read -rsn2 -t 0.1 input
continue
;;
$'\r'|$'\n') # Ignore Enter key
continue
;;
$'\x7f') # Handle Backspace
buffer=${buffer%?}
echo -ne "\b \b" >&2
;;
$'\t') # Ignore Tab key
continue
;;
$' ') # Handle Space (ensure it's visible)
buffer+=$' '
echo -n " " >&2
;;
$'\xE2') # Windows/Super key (part of multi-byte sequence, ignore)
read -rsn2 -t 0.1 input
continue
;;
$'\x00'|$'\x01'|$'\x02'|$'\x03'|$'\x04'|$'\x05'|$'\x06'|\
$'\x07'|$'\x08'|$'\x09'|$'\x0A'|$'\x0B'|$'\x0C'|$'\x0D'|\
$'\x0E'|$'\x0F'|$'\x10'|$'\x11'|$'\x12'|$'\x13'|$'\x14'|\
$'\x15'|$'\x16'|$'\x17'|$'\x18'|$'\x19'|$'\x1A'|$'\x1C'|\
$'\x1D'|$'\x1E'|$'\x1F') # Ignore all Ctrl key combinations
continue
;;
*)
buffer=$buffer$ound
echo -n "$ound" >&2
esac
# Word wrapping logic
formatted_buffer=""
current_line=""
for word in $buffer; do
if [[ $((${#current_line} + ${#word} + 1)) -gt $LINE_WIDTH ]]; then
formatted_buffer+="$current_line\n"
current_line="$word"
else
if [[ -z "$current_line" ]]; then
current_line="$word"
else
current_line+=" $word"
fi
fi
done
formatted_buffer+="$current_line"
echo -e "\f"
echo -e "$formatted_buffer"
done | yad --text-info --width=200 --height=200 --tail
For character wrapping you would do next
Code: Select all
# Format output with line wrapping
formatted_buffer=""
for ((i=0; i<${#buffer}; i+=LINE_WIDTH)); do
formatted_buffer+="${buffer:i:LINE_WIDTH}\n"
done
But I wanted to combine both methods:
By default it will apply word wrapping, if the word exceeds line width if will do character wrapping and go to next line.
Without further ado, here it is >
Code: Select all
#!/bin/bash
LINE_WIDTH=45 # Characters per line before wrapping
while true ;do
IFS='' read -rsN 1 ound
case $ound in
$'\x1b') # Handle escape sequences (like arrow keys)
read -rsn2 -t 0.1 input
continue
;;
$'\r'|$'\n') # Ignore Enter key
continue
;;
$'\x7f') # Handle Backspace
buffer=${buffer%?}
echo -ne "\b \b" >&2
;;
$'\t') # Ignore Tab key
continue
;;
$' ') # Handle Space (ensure it's visible)
buffer+=$' '
echo -n " " >&2
;;
$'\xE2') # Windows/Super key (part of multi-byte sequence, ignore)
read -rsn2 -t 0.1 input
continue
;;
$'\x00'|$'\x01'|$'\x02'|$'\x03'|$'\x04'|$'\x05'|$'\x06'|\
$'\x07'|$'\x08'|$'\x09'|$'\x0A'|$'\x0B'|$'\x0C'|$'\x0D'|\
$'\x0E'|$'\x0F'|$'\x10'|$'\x11'|$'\x12'|$'\x13'|$'\x14'|\
$'\x15'|$'\x16'|$'\x17'|$'\x18'|$'\x19'|$'\x1A'|$'\x1C'|\
$'\x1D'|$'\x1E'|$'\x1F') # Ignore all Ctrl key combinations
continue
;;
*)
buffer=$buffer$ound
echo -n "$ound" >&2
esac
# Format output with line wrapping
#formatted_buffer=""
# for ((i=0; i<${#buffer}; i+=LINE_WIDTH)); do
# formatted_buffer+="${buffer:i:LINE_WIDTH}\n"
#done
# Word + Character Wrapping Logic
formatted_buffer=""
current_line=""
for word in $buffer; do
if [[ ${#word} -gt $LINE_WIDTH ]]; then
# If a word is too long, break it into chunks of LINE_WIDTH
while [[ ${#word} -gt $LINE_WIDTH ]]; do
formatted_buffer+="${word:0:LINE_WIDTH}\n"
word="${word:LINE_WIDTH}"
done
current_line="$word"
elif [[ $((${#current_line} + ${#word} + 1)) -gt $LINE_WIDTH ]]; then
# Move to a new line when exceeding LINE_WIDTH
formatted_buffer+="$current_line\n"
current_line="$word"
else
# Append word to current line
if [[ -z "$current_line" ]]; then
current_line="$word"
else
current_line+=" $word"
fi
fi
done
formatted_buffer+="$current_line"
echo -e "\f"
echo -e "$formatted_buffer"
done | yad --text-info --width=200 --height=200 --tail
